Ключевые слова: aged, architecture, arrest, background, barb, barbed, barricade, barrier, blue, border, boundary, cage, cement, compact, concrete, cover, danger, dark, design, facade, fence, forbidden, freedom, gray, grey, guard, jail, metal, military, nobody, obstacle, outdoor, police, prison, protection, razor, security, separation, sharp, sky, spiked, spiky, steel, wall, wire,